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8. Troubleshooting
9128-A2-GB20-80 September 2002
8-27
Line Loopback
The Line Loopback (LLB) loops the information received on the selected interface
back to the source of the loopback. When used with a pattern test at the remote
node, LLB determines whether the problem is with the sending device or the T1
facility.
Main Menu
→
Test
→
Network Physical Tests
CAUTION:
This test may affect operation of frame relay PVCs assigned to the
selected port. While in loopback, the frame relay link will be down so any
IP data being sent while this test is active will be disrupted.
An LLB cannot be started when one of the following tests is active:
Payload Loopback, Send Remote Line Loopback, or an active Monitor Pattern
on this network interface.
Repeater Loopback on any other T1 interface with DS0s assigned to this
network interface.
Send Pattern Test on this network interface or any synchronous data port (Port
Use set to Synchronous) assigned to this interface.
Send V.54 or FT1 Loopback, or Data Channel Loopback on any synchronous
data port (Port Use set to Synchronous) assigned to this network interface.
97-15336
The T1
Interface
Other
T1
Interface
LLB
All
1s
Framer